#pragma once

//MYSQL版本

#include "../comm/util.hpp"
#include "../comm/log.hpp"

#include <iostream>
#include <string>
#include <unordered_map>
#include <cassert>
#include <vector>
#include <fstream>
#include <cstdlib>
#include <mysql/mysql.h>

//根据题目list文件,加载所有的题目信息到内存中
//model: 主要是用例和数据进行交互,对外提供访问数据的接口


namespace ns_model2
{
    using namespace std;
    using namespace ns_log;
    using namespace ns_util;

    struct Question{
        std::string number;//题目编号,唯一
        std::string title; //题目标题
        std::string star;  //难度
        std::string desc;  //题目的描述
        std::string header;//题目预设给用户的在线编辑器的代码
        std::string tail;  //题目的测试用例,需要和header拼接,形成完整代码
        int cpu_limit;     //题目时间要求
        int mem_limit;     //题目空间要求
    };


    const std::string oj_questions = "oj_questions";
    const std::string host = "127.0.0.1";
    const std::string user = "oj_client";
    const std::string passwd = "123456";
    const std::string db = "oj";
    const int port = 3306;

    class Model
    {
    public:
        Model()
        {}
        bool QueryMySql(const std::string& sql,vector<Question>* out)
        {
            //创建mysql句柄
            MYSQL *my = mysql_init(nullptr);

            //mysql进行数据库连接
            if(nullptr == mysql_real_connect(my,host.c_str(),user.c_str(),passwd.c_str(),db.c_str(),port,nullptr,0))
            {
                LOG(FATAL) << "连接数据库失败! " << "\n";
                return false;
            }
            //一定要设置改连接的编码格式,不然会出现乱码问题
            mysql_set_character_set(my,"utf8");
            LOG(INFO) << "连接数据库成功!" << "\n";

            //执行sql语句
            if(0 != mysql_query(my,sql.c_str()))
            {
                LOG(WARNING) << sql << " execute error!" << "\n";
                return false;
            }

            //提取结果
            MYSQL_RES* res = mysql_store_result(my);

            //分析结果
            int rows = mysql_num_rows(res);  //获得行数量
            int cols = mysql_num_fields(res);//获得列数量
            Question q;
            for(int i=0;i<rows;i++)
            {
                MYSQL_ROW row = mysql_fetch_row(res);
                
                q.number = row[0];
                q.title = row[1];
                q.star = row[2];
                q.desc = row[3];
                q.header = row[4];
                q.tail = row[5];
                q.cpu_limit = atoi(row[6]);
                q.mem_limit = atoi(row[7]);
                out->push_back(q);
            }

            //释放结果空间
            mysql_free_result(res);
            //关闭数据库
            mysql_close(my);
            return true;
        }
        bool GetAllQUestions(vector<Question>* out)
        {
            std::string sql = "select * from ";
            sql += oj_questions;
            return QueryMySql(sql,out);
        }
        bool GetOneQUestion(const std::string& number,Question* q)
        {
            bool res = false;
            std::string sql = "select * from ";
            sql += oj_questions;
            sql += " where number=";
            sql += number;
            vector<Question> result;
            if(QueryMySql(sql,&result))
            {
                if(result.size() == 1)
                {
                    *q = result[0];
                    res = true;
                }
            }
            return res;
        }
        ~Model()
        {
            //
        }
    };
}



